Experimental Investigation of a Two-Qubit Decoherence-Free Subspace

J. B. Altepeter, P. G. Hadley, S. M. Wendelken, A. J. Berglund, and P. G. Kwiat
Phys. Rev. Lett. 92, 147901 – Published 9 April 2004

Abstract

We thoroughly explore the phenomenon of a decoherence-free subspace (DFS) for two-qubit systems. Specifically, we both collectively and noncollectively decohere entangled polarization-encoded two-qubit states using thick birefringent crystals. These results characterize the basis-dependent effect of decoherence on the four Bell states, the robustness of the DFS state against perturbations in the assumption of collective decoherence, and the existence of a DFS for each type of stable noncollective decoherence. Finally, we investigate the effects of collective and noncollective dissipation.

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  • Received 31 May 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.147901

©2004 American Physical Society

Authors & Affiliations

J. B. Altepeter1,2, P. G. Hadley2, S. M. Wendelken2, A. J. Berglund2,*, and P. G. Kwiat1,2,†

  • 1Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-3080, USA
  • 2Physics Division, P-23, Los Alamos National Laboratories, Los Alamos, New Mexico 87545, USA

  • *Department of Physics, California Institute of Technology, Pasadena, CA 91125.
  • Electronic address: kwiat@uiuc.edu

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Vol. 92, Iss. 14 — 9 April 2004

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